u/Dismal_Broccoli_1846

I have sulfur smell in my wall watter with this chemical pump in the below pic.

The pump is kicking in and I can see water trying to go up the tube but it falls back down like it looses pressure. Water company wants to charge $200 to "replace the roller tubes" as annual maintenance.

Is this something I can do myself? Just replace the little rubber tubes at the bottom?